Perpetual date indicator



April 22, 1930. K. KLUGE ET AL PERPETUAL DATE INDICATOR 1926 5 Sheets-Sheet 1 Filed Feb. 19,

0 m m mi 5 5 K? Jrm A TTUR/VEYS April 22, 1930. K. KLUGE ET AL PERPETUAL DATE INDICATOR Filed Feb. 19, 1926 5 Sheets-Sheet 2 w ET 5 h p w my W5 April 22, 1930. K, KL E T AL 1,755,696

I PERPETUAL DATE INDICATOR Filed Feb. 19, 1926 5 Sheets-Sheet 3 KUR KLUGE ,4 TTQANEYS f/vym/ralas Patented Apr.f.22, 1930 UNITED STATES KURT KLUGE AND WALTER BER'IHOVLD, or BERLIN-HALENSEE, GERMANY- PERPETUAL DATE INDICATOR Application filed. February 19, 1926, Serial No. 89,481,111111 in Germany February 19, 1925.

This invention relates to a perpetual date indicator comprising rotatable disks on which the year, months, weeks anddaysare marked. This invention has for its object to improve the construction of the perpetual date indicator in such a manner that by one.

feeding movement per day all the necessary adjustings of the disks are effected absolutelyi automatically. This object isattained essentially by providing on the severaldisks teeth which stand in predetermined relation the one with regard to the others and'act,

through the intermediarylof feeding springs or pawls, upon one another'in such a manner. that by one ratchet pawl movement per day all the disks control mutually their positions in such a manner that the correct date is al-I' ways indicated'behind a window, the length of the month and the .leapyears being taken of the date indicator showing the position of theseveraldisks arranged the'one behind the other. i

Fig. 2 is a side elevation of Fig. 1. v 3

I Figs. 3,4, 5, Sand? show each one. of the several disks in plan view.

Fig. 8 .shows, in larger scale, a separate view of the ratchetpawls or feed springs and the position of the same with regard to the disks. m H Fig. 8 is a view showing the resilient connection between the month disk and one of" the numeral disks. g

Fig. 9 is a view similar to Fig. l, the disks having, however, outer teeth.

Fig. 10 is a side elevationof Fig. 9.

Figs. 11, 12,13, 14. and 15'show each one ofthe" disks driven by outer teeth? j] Fig. 16 is an end view and side elevation of the ratchet pawl for the outer teeth.

any other Fig. 17 shows,.in front elevation, a clock with the date indicator. 7 I

Fig. 18 is a side elevation of Fig. 17.

Fig.19 shows, in front 'elevatiomhow the ratchet pawl is driven by the clockwork.

Fig. 20 is a section through the shaftof the hour hand.

Onthe weekdays disk a (Fig. 3) the days I of the week from Monday'to Sunday are marked twice, in succession. The di'sk'has consequently '14 teeth a with which the spring-controlled ratchet pawl g (Fig. .8) en gages so that, at'the part rotation ofshaft i which takes place once every day." and atthe, movement of the ratchet pawls f, g'due to this] part rotation-and betweenthe. stop pins 72 anew weekday appearsevery day inthe window it of the casmg, 7

In front of; the weekday disk a a disk 0 for the second half ofthe'days of a month (16 to 31) isarranged which has teeth a g standing at difierent distances from the cen treof the disk-so that they are'situated on an irregular curve. Three special teethc serve -for a special purpose which will 'beherein afterexplained. .In front of disk c a disk' 6 is arranged on which the first'haltofthe I ing inner teeth 6' and an aperture 5 under neath a notch/b. init's rim. Only if. this notch 72 ,1 registers with the window kcan the 'da'ysot'a month are marked, said diskhavs.

corresponding figure on disk the read as at a rotation the notch b registers with thewindow so that the 16 marked on disk 'c becomes visible. The feed spring f has the tendency to expand in radial direction, this being. however, possible only when the aperture Z2 and the notch b are along the radius of thewindow. After the feed spring f has witht-he teeth b of disk Z) but with the teeth c ot disk 0 as these teeth are farther distant from the centre ofthedisk thanthe teeth'b';

The feed spring) has an arm 7" bent at an p bn of disk 6 the diskc is covered by it. I

entered into aperture 5 itno longer engages disk 6 and enabling-the pawlf to'engage the teeth 6'. again, while the teeth c being at the same radius as the teeth of disk a, thepawl' 9 then rotates not;,only the disk (4 msteps-but, also the disk 0 behind disk 6. Consequently,

at the end of the month, disk 5' is again advanced by the pawl f, while the blank space on disk 0 is brought'behind thewindow is" under cover of disk 6 by pawl g.

The month disk (Z has a catclnsprlng or .detent cl attached thereto and'which may be struck from the body of "said disk. The catch ip'ringextends. forwardly of the disk cl and yieldingly engages the disk 6, the free end of the catch, which'may' have a knob or depression thereon, enters the holes or cavities I) in By'this construction, each time a new'gnionth ishadjusted h-y the action'of the teeth d, the catch (P will draw the disk b aldfrgonestep;

fTheye ar-disk 6,1whi'ch inthe form of"con-' structi'on shown in Fig. 7 is designedfor 8 years hutmay-be arranged for anyother number ofyears,has marked on it, in the present case, the,l'e apey ears 1928 and 1932 four times v in succession and it comprises for, this leap year;adjusting special, teetl1,,the object of which will ;be hereinafter explained; V

Supposing the date indicator shows, as in the drawing, Monday, the 16th .of May 1926,

- the 16? on disk 0 stands then opposite the aperture in'the disk I) which stands in front of" disk 0, and which is of the same diameter asgthis' disk, 0, while-the figures 1 and 1 5 of" disk '6 arezcovered bylxthe cover plate'inwhich the wiiidowk is'ar'ranged: The aperture in. the disk 'b'iis invertical position and the feed spring -f, which during, thestepwise-rotation teeth offsaid disk, is. engaged with the aperture b and expanded in radial direction so thatitcanno longer engageywith the teeth of disk I; but engages with the teeth of disk 0'. The'-feedteeth of disk care, as can be seen, from the drawing, irregularly arranged,

difleren't from those of disk '7). The, feed spring f is moved once every day between the stoppins'and adjusts thereby the disks from 16 to 17 and so forth. At each feeding movement the disk a for the weekdays is also rotated one step by means of the pawl 9 so that at one feeding movement Tuesday, appears instead of Monday and" the 17th underneath Tii-esday, so thatthe date of'the day is indicated as Tuesday, the 17th of May'1926.

After this has continued u to the 28th of May the pawl expands further in radial clirectiori, as'the teeth for the 29th, 30th and 'by its rotation, rotated the disk I), through the intermediary of the catch spring, through one step so that the 1 comes behind the window and the indicator indicatesthe 1st of June, above which the corresponding day ofweekzis'marked. V 7

Tha teeth of the disk-1c between the 31st andlSth' areofsuch shape that the horizontalarm ofthe; fee'dl spring or pawl f is compressed in radia'l'direction, e. g. towards the centre ofthe disk, so that the feed spring engagesrwithtlie first tooth at'the leftside of theaperture' in disk Z)',. so thatat thenext following day-feeding the diskic is no longer rotated'stepwise but the disk If from the 1st" Upon rotation from.

to" the, 15th of June; the 15th to the" 16th of June' the pawl: f en'- 7 gages a tooth-of disk t ando'fdisk a so' that the-idon diskc ismoved into position behindthewindow arrdtheaperture of disk 6' is again brought-behind the window so that thefeed" spring; expands again in a radial direction and the further feeding which has already been described, withinthe apertune of disk I) takes'place again with the result that no longer disk 5, but from the 16th-of the month," diskc is rotated in'steps and, as the monthis *J une, the feed spring 7 after the 30th,- in addition to rotating the disk 0 so that 31 comes in line withwindow 7c, willza-lso rotate themonth disk (Z by one step as hereinhefore described, soythat instead'of June, uly appears behindthe'window, and owlng-torthe operation of the catch spring of of"the-fig u re disk I) engages with the feed th-e imoirth disk (Z; the disk bis rotated so that the 1 appears again behind the window.

' 7 Upon the next operationof the shaft, the

normal inoperative position; After the 15th of the month, disk 0 is actuated by the pawl f asadescrihed'aahove:so that the 16 appears Selim the: window,-: and theaperture of is b. 4

The month o-f Februaryj hasnormally 28 days but in a leap-year 29hdaysv. If'there'is no leapyearrtheofeed spring f is compressed clear oftheiap erture f of disk been the 28th,

' as the toothforFebruaryin the-month-disk d is closer to the centre ofthe diskEthanVt-he others, so that on the 28th -of Febru'ary it sim 'ltafiebfiny rotates-by one as. the dis1 ciand the month disk (has on the 30thfor 31st of other months; After the28thfof i February,

'Ma'rch appears, therefore, behind thewindew and thefl? on disk b is brought, as is,

the case at very change of month, behind this window. The disk 0. is also moved so, that the 29 is in line withwindow 70, though obscuredby'disk b, Upon the three follow ing operations or the shaft, the pawl g engages with oneof the special teeth c ef the disk 0 and moves it in three steps, i.-e. from 29 to 30 to 31?,and arto the blank space which is then behind the window k but obscured b'y disk v In the leap year, 19:28 or1932,care' is taken, by the corresponding adj ustmentof the teeth on the year disk e,"that the disk c'bringsthe 29th behind the Window *and'thajt only upon transition from the 29th of February to" the .neXt following d'ay are the yeardiskeand the month disk d simultaneouslyrotated] ,The

ranged four times in succession so that the yea 1928-coversthe tooth of disk d which yearrdisk rotates four, steps without/change of the numberfot' the year. This is important as at each adjustmentthe length for the feed spring f must be' altered in order to nsure thegcorrect part'rotation of the disks cand (Z,

On the 31st of December 1927 the number of the new year is adjusted; Oh the 31stof January 1928 'the disk e is rotatedby the lengthof one tooth. The new tooth-of the would otherwise be operative (February position). I v V H y will consequently be no ad us'tinent to the be rotated to the 29th, the, year-disk e-being at the sameitimej'rotatedby, one step. The

new tooth of theyear-disk which e'nter'sthus into operationthenreleases thetooth' oi' the month-disk '(lwhi'ch had been covered. After. the 29th, ofFebruary', the 1st of Marchwill diskisnumbe'r'ed from 1 to 15' and hasa notch inits'periphery between the 1 and the 15 to therefore be indicated.

In theforrn of constructlon show n'in Figs.

,Ito16, the arrangement of the disks a "to e is generally the same as in the form of construction which has been described above v with the exception thatthe driving isfefiected; (a by outer teeth and notby innerteeth. With this object in view, tooth-wheels a b ,;0 9,*

(Z and c are rigidi with said disks. The feed'pawls f f j (Fig. 16) are'mounted on hinges f controlled by;springsf t andv :"s adapt-ed to oscillate around an axle 2';

1 On the 28th of February there;

@The catch spring 01 engages with indentations (Z? of the toothedwheel 6 only five indentations being provided as, in thecase of the nionth'having 31 days, the advancing of disk 6 is effected directly by the feed spring. I

YFigs. 17 t o,19 show the manner inwhich the; date indicator may be connected with a clock. The shaft 8 of thelhour hand drives, 7

through the intermediary of a toothed wheel Z, toothedwheel m twice the size ofth'e latter wheel, and on the axle'o of toothed wheel m a tappetcam 0' is keyed. This tapp-et cam 0 rotates once around its axis in 24 hours'and makes the hinge r oscillate. A rod 8 extends through the hinge 1" and,

bynieans of the hinge s,operates the hinge 1 f and, consequently, the pawls f f, f

16), thereby effecting, by said'pawls, an advancement eachiday;

' Should the clock stop, the rod 8 can be released"byl removing"a coupling pin -25 and rod .9 canth u's'be operated by hand, so. that, the date indicator is controlled independent casing having a window therein, a disk markedwith the'names of the days, a phi-7.1 rality of superposed figure disks of equal diameter different from that of, the. day disk and numberedwith the dates of the .conse'cutive sections of the month, a month indicating disk next toYand: difiierent in diameter from the day andfigurefdisks, teeth on said disks, and'p'awl meansadapted to'be actuated once a day to act on'said teeth, said teeth being so disposed that they cause adjustment of the disks correctly each day, allowing for the length of the month and for the leap year.

ance with clai1n'1," wherein the front figure disk is numbered from 1 to 15 and-has a notch perpetual date indicator in accord in its periphery betwjeenthe 1- and the 15t0 expose thefigures on the rearfigure disk, said front disk also having an aperture @in' the toothed portion toeffect release of said front. disk'from' said'pawl means, and a year disk of different diameter arranged next to the month disk and provided with teeth wherebysaid disk is adjustable when required,

.3.,A-perpetual'date indicator in accordance with claim 1, wherein the front figure;

expose thefigures .on the rear figure disk,

said front disk also having an aperture in the toothed portion radially disposed 'be-,'

"w be teeth whereby said pawlinieans acts first upon the teeth on the front disk until the notch registers withthe window, whereuponsald toothed portion to effect release of said front disk from said pawl means, a. year disk of (liiferent diameter arranged adjacent to the month disk and prci' idedwvith teeth whereby 1 said 'diskis adjustable, when required, and

wherein said frontfigure disk is provided with cavities arranged concentrically to said operatingshaitt, anda catch spring arranged on the month disk and engagcable in said cavities and which rotates the frontdisk each t me the month diskis rotated until the figure V 1' appears oppos te the window.

5'. A perpetual date indicator in accordance with claim '1, wherein the days of the week are markedtwice around the day disk so that theteethof; said disk are approximately similar to theteeth ofthe other disks.

' 565A perpetual date' indicator in accordance with claim 1', wherein the front figure disk is numberedvfrom 1 to and has a i notch in itsperipherybetween the 1 and the 1'5to expose the figures on the rear figure disk', sa'id' front. disk also having an aperture in the toothed portion radially disposed beneath said notc'hto efiect release of said front disk from said pawl means,v and a year disk ofdifferent, diameter arranged adjacent to the month disk andyprovided with teeth wherebygsaid" diskiis adjustable whenrea quired, and; wherein the disks are toothed internally and the pawl means consists of,

two feed springsffixedto said shaftat an angleto one another with one of said springs e serving'to rotate the day disk and the other I beingzbent ataniangle and extending through the year 1 disk, month di'sk and the figure disks, so that'either one, two or more disks can be'adjustedlby said;other springfaccord ancegwitli claim 1', wherein the front figure diskjis numbered from 1 to 15 and has a notch;in'its"periphery between the land the 15 to exposethe figures on the rear figure disk, said frontcdisk also having an aperture in 'theQt'Q'Qthed portion radially disposed beneathsaid notchrto eifectreleaseofsaidfront diskffrom said;pawl'means, ayear fdi'sk cof dilferent,.-diameter arranged next to the monthfdisli and provided with teeth whereby 1, ras es said isk is adjustable when required, and wherein the disks are toothed internally and he paw means consists o two. feed sp g-s.

fixed'to saidshaft atanangle to one another with one-of said springs serving to rotate the day disk and the ,otherbeing bent at an angle and extending through the year disk, month disk and the figure disks, so that either one, two or more =disksnan be adjusted by'said other spring according to the teeth on the severalfdisk's, and stops for limiting move-- ment of said feed'springs :to right and left and' causing movement of the disks only through a predetermined angle. ,7

'8. A perpetual date indicator in accordance with claim 1, wherein the front figure disk is numbered from 1 to 1-5 and has a notch in its periphery b tween the land ,the 15 to expose the figures on the rear figure disk, said frontldisk also haying an aperture in the toothed portion radially'disposecl beneath saidinotch toefiectirelease of said front disk from said pawl-means, anda year disk of different diameter arranged next to the.

month disk and provided with teeth whereby said disk is adjustable when'required, and

wherein the disks are toothed internally and the pawl means consists "o'f'two feed springs fixed to said sha ft at an' angle to one another with one of said springs serving to rotate the 'dayl diskandthe other being bent at an angle and extending'through theyear disk, month diskand'the figure disks, so'that either one, two or more disks can be adjusted by said other spring according to the teeth on the several disks,and'wherein the figure disk for the second'halfof'themonth is provided with three special teeth with which one of the two feed springsengages at the end of;a month, whereby as the disk for the first half of the month rotates the disk for the second .half of them'onthis so adjusted that after the complete rotation; of'the first disk the figures on ghe secondidisk appear correctly at the winow. a V

9.'perpjetua'l1 date indicator in accordancewithqclaim 1, wherein the front figure diskis numbered from,1lto,l5 and has a notchin its periphery betwecnithe 1 and the 15 to exposethe figures on the .rear "figure disk,.;saidffrontdiskalso having an aperture in the toothed portion radially disposed beneath saidnotch to eifectrelease of said front disk from said pawl means, and a year disk of different diameter arranged next to the month disk and provided with teeth whereby said disk is adjustable when required, and

wherein. said year disk has the leap years marked four times in succession and, theteeth therein are so arranged that during leap yearsithe year disk makes a partial rotation onithe 29th of February and on three prior occasions commencing with the last day of the previous :year..

10'. A perpetual dateeindicator comprising mately equal size and provided with teeth a plurality of 'superposeddisks having central bores therein, certain of the bores being non-circular, said bores being of approxialong their peripheries, and a single expanding pawl engageable with the teeth of said disks, said teeth being so positioned with re spect to the centers of the respective disks 1 that said disks are rotated in step-wise fashion by said pawl in a predetermined sequenee.

In testimony whereof We have aflixed o ur signatures. a v

KURT KLUGE. WALTER BERTI-IOLD; 

